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Saturated solution of KNO3 is used to make 'salt-bridge' because:

(a) velocity of K+ is greater than that of ${\mathrm{NO}}_{3}^{-}$

(b) velocity of ${\mathrm{NO}}_{3}^{-}$ is greater than that of K+

(c) Velocities of both K+ and ${\mathrm{NO}}_{3}^{-}$ are nearly the same

(d) KNO3 is highly soluble in water